Try doing the same test again but with your savefile hidden (ie just the generic Precise with no personalisations.

I found a similar issue with Librecad (32 bit) when I installed it on a system that had "Scantailor" installed. There is obviously potential for Librecad to have a conflict with other QT based software so if you test it on a basic Precise that has no other QT software installed it might run ok.

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